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The device driver routines are stored in a library format similar to the format of the standard library. As with other libraries, the device library has a number of code vectors that are a part of the library structure. These include the eight standard code vectors that are always required in a library: the vectors that point to the OPEN, CLOSE, EXPUNGE, and EXTFUNC rou tines, plus four others that are reserved for future use. A device library also contains fif teen additional required code vectors that point to the GoIO, DoIO, SendIO, AbortIO, Read, Write, Reset, Update, Clear, Flush, Stop, and Start routines, plus three additional reserved entries.

The Message structure is placed at the top of the new structure. The next part of this new struc ture contains the data definition. If you study the definition of the parameters in these structures, you can begin to see how messages are passed between tasks in the system. These are some of the most impor tant points to remember: ■ The system can contain any number of tasks. Each task is defined by a Task struc ture. ) ■ Each task can deal with up to 32 signals assigned to it. Each signal is represented by a signal bit number.

These files will help you understand all of the system lists, structures, structure parame ters, structure linkages, macros, variable types, and so forth used by the Amiga library functions and macros. In fact, a thorough study of the INCLUDE files is one of the best ways to learn about the Amiga Exec and Graphics systems. The Exec Functions AMIGA PROGRAMMER'S HANDBOOK Introduction This chapter defines and discusses the Amiga Exec functions. The Exec functions provide a way for you to manage tasks, devices, libraries, lists, and other aspects of the Amiga system.